Adhesive compound or sizing.



UNITED STATES P TENT oFFIoE.

MQNE R. ISAACS, OF PHILADELPHIA, PENNSYLVANIA.

ADHESIVE COMPOUND OR SIZING.

No Drawing.

To aZZ'whom it may concern:

Be it known that I, MONE R. ISAACS, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented an ImprovedAdhesive Compound or Sizing, of whichthe following is a specification.My invention relates to the production of a casein solution or caseinglue suitable for use in sizing paper and textile fabrics, for

gluing woodwork, for paint manufacture and other suitable purposes. Forsuch purposes casein solutions have already been applied but in theseprior instances casein of 'a character different from that used by mehas been employed. Commercial casein, as at present used, is chieflyprecipitated from skim milk by means of an acid, either by an acid addedto the milk for that purpose or by the lactic acid developed in the milkitself by fermentation.

The casein used in my process is that prepared by precipitating milkwith rennet or similar unorganized ferments and such casein has hithertobeen used almost exclu-' sively as a food stufi or in the preparation ofa casein cement, this being due to the fact that hitherto there havebeen no known and commercially available methods of obtaming a suitablesolution from rennet casein. iVhile ordinary casein will dissolve inwater if- 11 to 15 parts of sodium biborate is added to every 100 partsof casein, rennet casein, when so treated, does not dissolve, but uponthe application of heat becomes a soft, viscous mass which may be usedas a cement but which cannot be made into a flowing solution, and whichcannot therefore be used as a sizing.

1n carrying out my invention I add to rennet casein, besides theordinary alkali or alkaline salt used in making ordinary caseinsolutions, a soluble fluorid and, if a solution is desired, water isalso added, with or with out the application of heat. The combinedaction of the fluorid and the alkali or alkaline salt renders the rennetcasein soluble and a well flowing solution is obtained which possessesgreat adhesiveness and is well adapted for use as a sizing glue oradhesive- I prefer to use sodium fluorid but do not desire to restrictmyself to this as any solu- Specification of Letters Patent.

may be used or hydrofluoric acid itself may be taken, though the latterwould ofcourse be converted into a fluorid by reacting with the alkalineingredient.

A composition containing 100 parts of rennet casein, 15 parts of sodiumbiborate and 15 arts of sodium fluorid will, upon the addltion of 400parts of water, give a solution of a suitable character. Theseproportions are merely given asan example and I do not desire torestrict myself to them or to any specific formula as various changesmay be made in the proportions depending on the quality of the caseinand the purpose for which the solution is intended. Instead of sodiumbiborate any one or more of the alkalies or alkaline compoundsordinarily used in making casein solutions may be taken. This I may usein conjunction with a fluorid, calcium hydroxid, sodium Pa tented May24, 1910. Application filed January 9; 1908. Serial No. 409,969.

hydroxid, sodium carbonate, sodium phosbe used casein precipitated withany simi- I lar unorganized ferment giving a casein of like character;and by rennet casein, as used throughout my specification and claims, Imean a casein-obtained by precipitating casein from milk by any suchunorganized ferment (the milk being preferably first skimmed) and thenseparating the casein from the whey and either drying the casein orusing it in the wet state.

In the United States Letters Patent No. 838,785, granted me on December18, 1906, I described a method of improving the charactor of caseinsolutions by theuse of a fluorid as an ingredient, but neither there norelsewhere, as far as I am aware, has the action of fluorid in makingrennet casein soluble been described.

I claim:

1. A glue or adhesive compound composed of rennet casein, a hydrofluoricacid compound, alkaline matter and water.

2. A glue or adhesive compound composed of rennet casein, sodiumfluorid, alkaline matter and water.

3. A composition of matter, consisting of rennet casein, a hydrofluoricacid compound, and alkaline matter.

ble fluorid or compound of hydrofluoric acid 4. A composition of matter,consisting of rennet casein, sodium fluorid, and alkaline -ing in addingthereto a hydrofluoric acid compound and alkaline matter.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscrlblng Witnesses.

MONE R. ISAACS.

Witnesses HAMILTON D. TURNER, KATE A. BEADLE.

